Reverse-gear for engines



(Modem v 3 Sheets-Sheet 1.

0. AVERY. 4

REVERSE GEAR FOR ENGINES.

Patented June 2, 1885.

(ModeL) 0 AVERY 3 Sheets-Sheet 2.

REVERSE GEAR FOR ENGINES. No. 319,051. Patented June 2, 1885.

N. PETEHE PhnxuLflhngrnpMY, Washington. ne

(ModeL) 3 Sheets-Sheet 3.

O. AVERY.

REVERSE GEAR FOR ENGINES.

Patented June 2, 1885 AZ/$47M N. PETERS, Photq-Uthognpilcr. Wllhingmn.Dv c.

UNITED STATES Parnn'r @rrici-ii.

oLivn-n avnnr', or escrow, NEW YORK.

REVERSE-GEAR FOR ENGINES.

SPECIFICATION forming part of Letters Patent No.319,05l, dated June 2,1885. Application filed February 20, 1885. fllodcl.)

To all whom it may concern.-

Be it known that I, OLIVER AVERY, of Goo ton, in the county of Tompkinsand State of New York, have invented certain new and useful ImprovementsReverse-Gears for'Engines; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled .in the art to which it pertains to make and use it,reference being had to the accompanying draw ings, which form part ofthis specification.

My invention relates to an improvement in reverse gears for engines inwhich a slide valve is used; and it consists in the combination of thedriving-shaft, the pulley secured thereto and havingaslot or slotsthrough its ends, the eccentric having a slide and inclined guidessecured thereto, inclined guides placed inside of the pulley andextending at an. angle to thosesecured to the eccentric, the followerswhich move upon the guides, and the sliding sleeve which is connected tothe followers, as will be more fully described hereinafter.

The object of my invention is to use only one cceentricin reversegearsfor steam, gas, and hydraulic engines in which a slide-valve is used,whereby the eccentric can be shifted from one side of the shaft to theother, so as to reverse the revolutions of the drivingshaft and enable avariable cutoff to be obtained.

Figure]. is a longitudinal section of a reverse-gear embodying myinvention. Fig. 2 is an end view of the pulley and the parts placedinside of it, the sleeve being removed. Fig. 3 is an end view taken fromthe opposite end. Fig. 4 is a similar View to Fig. 2, the followers andsleeve being removed. Fig. 5 is aperspective of the followers. Figs. 6,7 are detail views. Fig. 8 is a side elevation of my gear, a part of thepulley being broken away.

A represents the driving-shaft, and B the pulley secured thereto. Oneend of the pulley is open and the other one is closed, and the closedend forms bot-h a face-plate, C, and a hub, a, for the pulley. Upon thisface-plate the slide 1) moves back and forth when the eccentric isshifted from one side of the shaft to the other. Through this end 0 areformed four slots, which have their inner ends par allel with eachother, and their outer edges on an angle to correspond to the angle onthe lugs K. The slots are slightly longer than the lugs,in order toallowof an end movement of the guides L and to allow lost motion to betaken up.

The slide D is made in a single piece with the eccentric G, and has aslot, H, made through it for the hub of the pulley to pass through, andso that the slide can move freely back and forth across the end of thepulley. The slide is held in place upon the end of the pulley by meansof the guides J,which are secared to the end plate, 0, by means ofsuitable bolts. In order to assist in keeping these guides in place,each one is provided with a lug or projection, K, to fit incorresponding holes in the end plate, 0.

Secured to the slide are the two inclined guides L, which pass throughthe slots T and the followers M, and which cause the eccentric to moveacross the shaft at every endwise movement of the followers. As theslide is moved across the face of the end of the pulley, the movableinclined guides are moved correspondingly through the pulley.

In the pulley are also two other guides, N, which extend in oppositedirections, or at any suitable angle to the other guides, L; but which,instead of being movable, are stationary. In this case they are securedto the in nor side of the pulley; but they may be socured to any otherpart. The object of the guides is to prevent the followers from beingcarried back and forth in the pulley with the two movable guides L, andto cause the followers to move diagonally endwise in the di rection ofthe length of the shaft. Two of each of the inclined guides are hereshown and described; but only one of each may be used, if so preferred.lVherc two are used, as here shown, the followers are more perfectlysupported and guided in their move ments than where only of each kind isused.

The followers are applied to opposite sides of the shaft, but free fromit, and are secured together by means of the bolts 0, and by means ofwhich bolts the followers can be drawn closer together from time to timein order to take up the wear. Each of the followers is cut out on itsinner side, as shown, so as to fit over the inclined guides and to movefreely back and forth upon the them. These followers M move diagonallyacross the shaft at words, if the pitch or inclination of both sets.moves one inch the eccentric moves two.

of guides is the same, then while the follower In order to allow thismovement, the openings through the followers are elongated, so as to beequal to thepitch or inclination of one set of guides, while the openingthrough the slide andieecentric is equal in length to the amount. ofinclination on the two sets of guides. Projecting from the outer ends ofthe two parts of the followers are the two bolts P, which pass throughthe two slotted arms or extensions of the slide Q, which is applieddirectly to butnot fastened to the shaft. To the outer sideof the twoslotted arms are applied -the washers R and the nuts S. The two armsarea-slotted so as to allow the bolts P to move diagonally across theshaft with the followers. Applied to the outer end of this slideis aloose sleeve, T, which is provided withthe lugs U, to which the reverseor controlling lever is fastened. This sleeve is placed loosely on theslide, so as not to be affected by the revolutions of the slide, whichrevolves .with .the shaft A. The slide with the slotted arms answers thedouble purpose ofallowing the followers to move across the shaftdiagonally,and to prevent the sliding friction between the followers andthe slotted arms from reacting on the reverse-lever when the eccentricis-in motion.

A movement of the reversing-lever causes the slide to move the followersand the followers to move the slide D and eccentric G,

and thus shift the eccentric from one side of the shaft to the other. Byshifting the eccentric'from either extreme of its throw toward itsguidegeanat the same time keeping the lead of the valve the same,ashorter cut-off is obtained.

The eccentric is here shown as moving straight across the shaft; but itmay move in a circle across or havea swinging movement.

Having thus described my invention, I claim 1. The combination of thesleeve to which the reversinglever is connected, the slide 2. Thecombination of the pulley having its end form both a face-plate and ahub,"and

provided with slots for themovable inclined guides to pass through, withthe slide D, ec-

centric, and the guides J applied toIt.-he-.:end.v

of the faceplate, substantially as shown.

3. The combination of thepulley having one end formed into a face-plate,the stationary inclined guides, and the movable inclined guides, thefollowers, and the slide whichis."

moved by the reversing-lever,-substantially as set forth.

In testimony whereof I affix my signature I WILLIAM W. HARE, WILLIAM E.MOUNT.

